The genus Stactobiella Martynov (Trichoptera, Hydroptilidae) in Japan Author Ito, Tomiko text Zootaxa 2020 2020-03-09 4748 3 561 571 journal article 10.11646/zootaxa.4748.3.9 75d37244-7649-49b9-b6f8-f603c61005b8 1175-5326 3815024 850379E4-B780-4D14-9B4B-9F753849D51B Stactobiella amami sp. nov. ( Figs 4 , 6 ) Diagnosis . The male of this species is somewhat similar to those of Stactobiella parallelica Zhou et al . 2016 and S. mutica Zhou et al . 2016 , described from south-eastern China , in having widely curved inferior appendages, but is clearly distinguished from the latter by presence of long ventro-lateral appendages. Adult . In males, wings and antennae brown; forewings each 1.5 mm long and hind wings each 1.2–1.3 mm long (n=3); antennae each 18-segmented, 0.6 mm long (n=1). Males with short ventral process on abdominal segment VII. Male ( Fig. 4 ). Segment IX shorter than segment VIII, with pair of long anterior apodemes; with lateral processes posteriorly and rounded ventral sclerite postero-mesally. Segment X membranous, subrectangular. Subgenital plate heavily sclerotized, thick, strongly curved ventrad. Ventro-lateral appendages directed dorso-posterad basally, gently curved ventro-mesad at proximal 2/3, acute apically in lateral view; in ventral and dorsal views, almost semicircular in shape with broad middle parts and acute apices. Inferior appendages plate-like, each with ventral quadrate lobe in ventral view, broadly bar-shaped in lateral view; few long and many short setae marginally. Aedeagus almost straight, gradually tapered distally, tiny cleft apically. Female . Unknown. Holotype . Male , Japan , Ryukyu : Amami-o-shima, Uken-son , Kawauchi-gawa , middle reach ( 28.2667 N , 129.3500 E , 90 m above sea level .), 20.x.2014 , T . Ito, light pan trap (CBM-ZI 0178574). Paratypes . 1 male , same data as holotype (CBM-ZI 0178575) . Other specimens . Amami-oshima : 1 male , Yamato-son, Materia-gawa, upper reach, 21.x.2014 , T . Ito, light trap . Distribution ( Fig. 6 ). Japan (Ryukyu: Amami-o-shima). Habitat . Adults of this species were collected near rapid streams with large rocks. Etymology . The name “ amami ” is a noun in apposition, coined from the type locality. Japanese name . Amami-sawa-himetobikera.